Abstract: An intervertebral disk prosthesis designed to replace at least partially an intervertebral disk which is composed of a left half-disk, and a right half-disk, each of the half-disks covering a half-disk surface. The prosthesis is at least one prosthetic member each of which having a rigid upper plate, a rigid lower plate, and an elastic cushion placed between the upper plate and the lower plate. The elastic cushion has an upper face attached to the upper plate and a lower face attached to the lower plate. Each prosthetic member covers no more than the half-disk surface so as to replace either or both of the left half-disk and the right half-disk.